最新刊期
卷 31 ， 期 Z1 ， 2015
- 摘要：The strategy and suggestions about the scene of 4G small base station based on network architecture of TD-LTE were described.Some problems at the engineering applications were combed,items were analyzed and the solving methods were introduced.关键词：small base station;network architecture;deployment strategy;application scenario753|1754|0更新时间：2024-06-05
- 摘要：In the view of the limitations of current 4G network capacity expansion standards,the perception and evaluation standard of classification of service was formulated from the service perception,and the correlation between the service perception and network was studied,which loaded to determine the threshold of capacity expansion in various types of services.关键词：PRB utilization ratio;capacity expansion;service perception667|1385|0更新时间：2024-06-05
- 摘要：At first,the LTE FDD network coverage,capacity and service support capabilities were analyzed,then the main problems facing the development of LTE FDD and deployment strategies were analyzed deeply,and specific suggestions for the current development of CMCC 4G network were put forward,the LTE FDD deployment of next step work was prospected.关键词：LTE FDD;depth coverage;interoperability;carrier aggregation;load balance750|1824|0更新时间：2024-06-05
- 摘要：At first,the existing LTE carrier bandwidth allocation scheme was analyzed.According to characteristics of the LTE spectrum bandwidth resources,a innovation method of capacity promotion was proposed,and the planning network carrier allocation scheme was introduced in detail.Finally,the feasibility of the scheme was confirmed through rigorous and scientific field test and analysis.关键词：carrier compression;capacity promotion;carrier frequency configuration666|1488|0更新时间：2024-06-05
- 摘要：The TD-LTE and LTE FDD fusion network is the trend of the future LTE network.With the further development of 4G network and the rdeuction of GSM network load,China Mobile will double existing GSM frequency resources for LTE FDD network construction.The LTE TDD/FDD fusion networking opportunities and challenges for the introduction of LTE FDD,GSM frequency reset strategy,the setting of interference isolation,antenna construction method and the selection of main equipment,and the future network structure optimazation problems,were analyzed.关键词：LTE TDD/FDD;fusion;strategy829|1263|0更新时间：2024-06-05
- 摘要：Firstly,the similarities and differences between the acceptance of the TD-LTE VoLTE wireless network engineering and other wireless network engineering were discussed.Then,referring to the different phases of engineering acceptance,the choice of indexes was analyzed.And finally,by driving tests and comparison research,the values of the index were suggested.关键词：VoLTE;wireless network;engineering acceptance;index choice;voice service;video service;TD-LTE706|1071|0更新时间：2024-06-05
- 摘要：The deployment of VoLTE involves all aspects of the network, among them the construction of IMS core network is more crucial. The IMS networking solutions of different manufacturers' devices after the deployment of VoLTE were studied and many recommendations were proposed, which would provide reference for the deployment of VoLTE commercial network.关键词：VoLTE;IMS core network;different manufacturers'networking754|1073|0更新时间：2024-06-05
- 摘要：The urgent monitoring and diagnosing problem of antenna system was researched.Firstly,problems and fault diagnosis situation of antenna were analyzed.Secondly,by analyzing the impact of the antenna system parameters on network quality,a platform of antenna quality detection and fault diagnosis for GSM,TD-SCDMA and TD - LTE network was developed.Finally,the practicality and accuracy of research results is verified through the web application.With this method,the parameters of the antenna and cable system could be detailedly analyzed.it broken away from the traditional fix- after- failure maintenance process by finding small problems which was hard to identify before major failures occur.关键词：antenna system;malfunction;detection;optimization804|1292|0更新时间：2024-06-05
- 摘要：High-speed railway is a special scenario of 4G network coverage,the project planning and construction of high-speed railway 4G network coverage have special difficulty,wireless coverage is different.High-speed railway scenario 4G voice solution needs to use different voice deployment strategy according to the quality of wireless coverage.The current situation of high-speed 4G network planning index and the ability to support voice services were analyzed,the alternative voice program under the high-speed railway 4G coverage was researched.Considering enhancing the user experience and feasibility,the feasible high-speed railway scene 4G voice service deployment recommendations was put forward.关键词：high-speed railway;4G;voice solution568|827|0更新时间：2024-06-05
- 摘要：With the development of national economy,marine fishery and marine tourism grow rapidly.The demand for data communication in sea area is increasing in recent years.It is an opportunity for mobile operators to build a high quality sea area coverage network,so as to develop market and enhance brand competitiveness.According to the on-site test results and the configuration parameters,together with the technical features of LTE FDD and TD-LTE,the coverage capability of LTE FDD and TD-LTE in sea area was analyzed.The analysis of the test results may also provide guidance for LTE network planning and design in sea area.关键词：LTE FDD;TD-LTE;sea area coverage;test620|1364|0更新时间：2024-06-05
- 摘要：The planning and marketing situation of TD-LTE were analyzed,the analysis to the user terminal usage and user service was carried on,the influence of distribution of users and user terminal types of data traffic were analyzed,the process of TD-LTE in meticulous planning and marketing according to the user behavior were determined,the process through the TD-LTE fine planning and marketing practical application were verified.关键词：TD-LTE;user distribution;terminal type;business type;network planning;traffic statistics;IMEI479|876|0更新时间：2024-06-05
4G
- 摘要：4G technologies with high data rate is flexible and has matured sufficiently,it has a promising application prospect in automatic distribution systems.However,communication networks for power grid should be more security,but the security protection of 4G network for power gird is not mature.Based on the application mode of 4G network in power system,the security risk was analyzed,then the specific safety protection methods were presented,which would guide the further application of 4G network in power system.关键词：4G network for power grid;security risk;security protection576|1398|0更新时间：2024-06-05
- 摘要：Peer to peer systems are widely deployed in the internet.Its self-healing and self-organizing framework will facilitate plug and play,high reliability and other features of the energy internet.But it brings new threat.The abstract features were researched.The threats introduced by peer to peer networking in the energy internet scenario were analyzed,and accordingly countermeasures were given.关键词：energy internet;P2P network;security492|566|0更新时间：2024-06-05
- 摘要：Aiming at the dynamic and real-time characteristics of network security situation prediction,a network security situation prediction model based on hidden Markov model（HMM）was designed.According to the HMM,the situation in t+1 from t time can be calculated.Meanwhile,the maximum entropy algorithm was combinated with HMM to improve the accuracy rate.The analysis and simulation experiments show that the method has the characteristics of autonomous learning and active defense,and it also balance the speed and accuracy.关键词：network security situation prediction;hidden Markov model;regularization;network security638|1285|0更新时间：2024-06-05
- 摘要：In order to solve the problem that the power PTN equipment management system vulnerable to be attacked and vulnerability,the risk factors of electric power PTN equipment network management system were proposed based on the architecture of PTN equipment network management system.From the factors of economic,security and maintenance efficiency,the network deployment of equipment network management system based on MPLS-VPN power data communication network was proposed.The out-band and in-band DCN security deployment plan of province-level,city-level and country-level was put forward.Finally,the boundary security program was proposed for the interaction between the PTN equipment network management system and other systems.关键词：packet transport network;equipment network management;security;power communication495|1023|0更新时间：2024-06-05
- 摘要：Abstract:Traditional multi service transport network based on SDH has a low adaptability to the data service and flexibility.PTN technology which makes up the deficiency of the original SDH network is a good supplement to SDH network.According to the requirements of security performance in PTN equipment,the technology and theory of multi index comprehensive evaluation was studied by referring to the relevant standards,the key evaluation index of power PTN security performance test was put forward.Finally,the security performance of the three models was evaluated by using the analytic hierarchy process and fuzzy evaluation system,and the feasibility of the evaluation system was verified.关键词：PTN;security performance;key index;evaluation380|1448|0更新时间：2024-06-05
- 摘要：Application of case-based reasoning（CBR）to generate grid infrastructure accidents emergency disposal scheme,can provide auxiliary decision scientific method for emergency people.Through investigation and analysis of the electric accident case,conclude basic situation,disposal process,disposal effect in three aspects of the characteristic attributes presentation framework of power accidents.Search similar case in two methods by means of inductive retrieval and similarity calculation.The determination of membership function of fuzzy attributes by using expert scoring was put forward.Fuzzy attribute similarity by membership functions was calculated and the power accidents case-based reasoning emergency disposal of the auxiliary decision-making process were given.关键词：power accident;case-based reasoning;emergency;assistant decision642|700|0更新时间：2024-06-05
- 摘要：Each index to measure the vulnerability was analyzed.A mathematical definition of strong security was proposed,and the loss measurement and forecasting of vulnerability were used to solve the problem of software dependability uniform dimension.At the same time,loss occurrence law and the number of vulnerabilities found similarities between the law were discussed,to determine whether the use of software defect prediction model to predict the amount of loss.By referring to the classical G-O model,the predictive model of software loss was established,namely model was developed to predict the loss of G-O based vulnerabilities,and the accuracy of the model and the practicability of the test by using the actual data in the vulnerability database.关键词：security vulnerability;loss measurement;G-O model;prediction model349|651|0更新时间：2024-06-05
- 摘要：Rapid development of information and communication technology has led China National Grid Corp into the era of intelligent,informational and automated,simultaneously with wide application of information and communication technology in smart grid also providing more ways for attackers to invade and attack power system.A DDoS attacks detection method based on modified CUSUM with dynamic threshold was proposed according to BloomFilter address statistics in smart grid.The proposed method used dynamic threshold technology based on BloomFilter normal traffic statistics,and optimized traditional EWMA algorithm to identify threshold of DDoS attacks,finally modified CUSUM algorithm in order to efficiently detect DDoS attacks in smart grid.Simulation experiments demonstrate that proposed method has high detection speed and precision for DDoS attacks in smart grid,and the system overhead is small.关键词：smart grid industrial control system;attack detection;DDoS,EWMA;CUSUM631|926|0更新时间：2024-06-05
- 摘要：With the development of computer technology,cryptographic algorithms were applied more and more widely in the field of information security.However,it has been a very important problem that how to achieve high performance,high security encryption algorithm and more convenient application in the software and hardware environment.In future grid environment,study of the electric power industry special lightweight block cipher algorithm can get rid of the actual state that only using general algorithm,also makes the information and the safety of the power system more self controlled.According to the electric power industry central business security requirements,the lightweight block cipher algorithm of special power of better performance,higher safety and more convenient application were realized.关键词：cryptographic technique;block cipher algorithm;light block cipher492|1053|0更新时间：2024-06-05
- 摘要：With the development of smart grid interactive,the database interaction between the information inside and outside is increasing.A method of SQL access log compression for power business system to respond to the demand of database security audit for the power system was designed in detail.This method can realize the compression of SQL access log and have the function of simple classification for SQL logs.The test results show that the method can achieve a large margin compression of SQL access logs and meet the requirements of log preprocessing for the database behavior audit of power business system.关键词：power business;security audit;logs compression;pretreatment359|478|0更新时间：2024-06-05
- 摘要：To detect the robustness of communication module of intelligent electronic devices（IED）in smart station,a device robustness test method was presented based on abnormal messages,and a robustness testing system was achieved.Some devices were selected for robustness test experiment to verify the rationality and feasibility.Results show that the method can effectively detect the robustness of devices and locate the abnormal messages which cause devices' failure.关键词：robustness test;intelligent electronic device;smart substation518|544|0更新时间：2024-06-05
Network and information security
- 摘要：Under the background of SDN technology from the college to commercial,the research results of OpenFlow protocol optimization,application oriented flow table design,SDN multi-domain control,data center network routing optimization and requirements of security network architecture were introduced and summarized.At last,the application scenarios and research directions for the future SDN technology was proposed.关键词：SDN;OpenFlow;controller;optimization597|2249|0更新时间：2024-06-05
- 摘要：At present,the mobile data traffic is growing rapidly,Based on the evolution trend of mobile communication network to 5G and NFV/SDN technology,the evolution direction of core network future architecture was presented.The demand for the core network of the service development and technical evolution,the core network status and future evolution direction of core network architecture were introduced.The result has guiding significance for the future development of the core network and network construction.关键词：large flow;NFV;SDN;network;architecture687|2147|0更新时间：2024-06-05
- 摘要：The State Grid had decided to construct next generation switching network using IMS technology,so the existing access devices and equipments needed to be updated or formed.Four kinds of access equipment unit were introduced,which were access gateway（AG）,integrated access device（IAD）,IP PBX and SIP phone.According to the functions and usage of above 4 equipments,the method to construct the access network to update the old one was analyzed.Incorporation with application scenes of communication services,the different access methods were researched and the project solutions for SGCC was put forward to build IMS access network.关键词：IMS;access network evolution;access method514|1271|0更新时间：2024-06-05
- 摘要：In September 2015,China Mobile launched a pilot project of NFV network,and applied NFV framework for the construction of“the new call”,“the new message”platform in the converged communications project.NFV is the integration of IT and CT,and combined their characteristics during planning and construction; but due to the fact that this technology is not yet mature,there are some problems gradually exposed in the planning and construction of the current NFV network.Based on the experience of several China Mobile's NFV projects,the key problems in NFV planning and construction were discussed and summarized.关键词：NFV;NFVI;RCS;MANO394|520|0更新时间：2024-06-05
- 摘要：With the development of SDN technology,the outlook of its application is getting bright.The basic features of SDN and key technologies in transport network were first analyzed and concluded.Secondly,with the association of simulation plane,typical traffic engineering application scenarios were introduced.At last,the conclusion of scenarios application and the value of SDN usage were also extracted and abstracted in order to propose necessary suggestion for future deployment.关键词：SDN;domain virtualization;resource-driven dynamic;traffic engineering390|665|0更新时间：2024-06-05
- 摘要：The core idea of SDN（software defined networking）is that the control plane and data plane are separated,which makes the network traffic can be flexible controlled.Since SDN has these characteristics,the traffic monitoring and control in SDN have significant differences with traditional IP networks.A network traffic monitoring and control system based on sFlow technology was presented.With the application of sFlow,the process of data collection was separated from the control plane of SDN.The experimental environment was constructed based on OpenDaylight controller and Mininet,and the abnormal traffic was simulated by DoS（denial of service）attacks.The experiments show that the proposed network traffic monitoring and control system can effectively intercept the abnormal traffic.关键词：SDN;traffic monitoring;DoS;port761|2419|0更新时间：2024-06-05
- 摘要：The electric power dispatching data network business requirements of the IMS system were analyzed,the networking of the dispatching data network method was proposed,and the amount of the dispatching data network users was researched.According to the technology development and the power communication services requirement,IMS technique was used to construct next generation communication system,and the electric power dispatching data network was needed to be designed to load IMS services.The calculation method of network bandwidth and multimedia business traffic model for loading multimedia businesses was studied.It has guiding significance to construct next generation communication network for smart grid.关键词：IMS;power dispatch communication;bandwidth forecast;traffic model334|811|0更新时间：2024-06-05
Future network
- 摘要：For the realization of digital transformation,three-domain integration of IT support system is imperative.The present situation and problems of the three-domain of IT support system were analyzed.The goal of overall development of IT system was proposed.The method of integration from the target architecture,basic resource layer,data layer,application layer was discussed.It can effectively support the digital transformation,and create an agile,internet based and open new generation operation support system.关键词：three domain integration;big data;two layers;SDN516|1366|0更新时间：2024-06-05
- 摘要：In 4G era,the development of new technologies and the great changes in the business model of telecom operators promote the progress of business support system cloudization.In order to improve the efficiency of the operation,the dynamic scheduling of cloud resources was explored.A resource scheduling model was proposed based on four business scenarios.关键词：cloud computing;dynamic scheduling;virtual machine387|883|0更新时间：2024-06-05
- 摘要：With the continuous development of cloud computing and big data,service requirement to compute and storage challenges the scale of single data center.Building a data center interconnection network has become a must to achieve the data center scale up and service deployment flexibility.By constructing data center interconnection network,telecom operators can further integrate IT resource as“cloud”,in order to increase the resource utility and fasten new telecom service deployment efficiency,so to enhance the core business competitiveness.The representative solution of data center interconnection and the technology characteristic was analyzed.Combined with the requests of telecom resource integration,several data center interconnection technologies and their deployment in telecom carrier cloud network constructions were analyzed.关键词：cloud computing;VM;VDC;SDN;VxLAN400|1084|0更新时间：2024-06-05
Operation and support
- 摘要：Communication network in smart substation carries monitoring and protection services,with real-time and reliability requirements.Based on the analysis of communication services characteristics in smart substation,a multilevel tree optical switching network architecture was proposed based on optical burst switch mechanism.Then,based on the structure and function of the primary node,slave node and edge node of optical switching network,and GOOSE,SV data flow in process layer network was analyzed.Finally,the communication process of the master node control plane based on the Round-Robin scheduling algorithm was described.关键词：smart substation;multilevel tree optical switching network;scheduling algorithm;data flow analysis452|543|0更新时间：2024-06-05
- 摘要：The development of network technology promotes the development of the traditional substation to the smart substation,where all devices can exchange the real-time information via the switch in the smart substation.In view of the strict time delay requirement of substation communication service,a full optical switching network architecture for smart substation was proposed,which avoided the operation of optical,electric and optical conversion,and realized the fast and reliable communication between the protection device and the smart terminal as well as the merging unit.关键词：smart substation;optical-switching network;network protection440|846|0更新时间：2024-06-05
- 摘要：On the basis of analyzing the security threats in smart substation,a security situation awareness framework was proposed,combined with integrated physical security,network security,system security,protocol security,data security and so on.And a network security monitoring solution for substations was provided.It was a special intelligent substation network security situation awareness device which could collect the security events,analyze them and generate situation analysis results.Further more,everal key technologies used in our frameworks were focused on.Finally,a design scheme including hardware and software for the smart substation network security awareness system and its implementation architecture were described,in which a multi-layer software architecture was adopted by the system,and a combinatory of the Intel Sandy Bridge,the bus structure and a modular design technology,was adopted in order to meet the need of high performance.关键词：situation awareness;network security;smart substation496|1387|0更新时间：2024-06-05
- 摘要：With the wide application of smart substation communication protocol IEC6150 and Smart Grid,IEC61850 safety issue has become a problem can't be ignored.Combined with IEC62351,in the internal of substation as a whole,from authentication,encrypted communications,anti-replay attack,key distribution,the communication protocol security enhancement with in side of the substation which included MMS,GOOSE and SMV protocol was studied.Encrypted packet analysis technology was discussed.Combined with the test equipment run conditions,the performance caused by protocol security enhancement equipment was analyzed.关键词：smart substation;secondary system;protocol security enhancement533|1383|0更新时间：2024-06-05
- 摘要：In order to meet the requirements of high real-time performance in the process of the smart substation,the typical communication network architecture,the real-time requirement of data service and the composition of network data delay were analyzed from the two aspects of communication system.And a solution for optimizing the real-time performance of communication system was presented.关键词：smart substation;communication system;real-time260|1523|0更新时间：2024-06-05
- 摘要：To realize shared-port and shared-network in substation,a method based on VLAN and the time division multiplexing technology were studied,and the wavelength mapping method based on WDM technology by mapping different services to different wavelengths was put forward.Finally,a method based on optical switch was put forward which realized the “shared-port and shared-network”by edge pre-processing equipment and optical switching equipment.关键词：shared-port and shared-network;virtual local area network;time division multiplexing;wavelength division multiplexing;wavelength mapping;all-optical switch282|653|0更新时间：2024-06-05
- 摘要：An IEC61850 communication model for network devices in smart substation was proposed,and the network device status information management was imtroduced into a unified monitoring and management system of smart substation.The substation monitoring system can directly get the state information and configuration information of the communication network and network devices,such as link status,bandwidth status,port forwarding state,the port packet loss rate,bit error rate and so on.关键词：smart substation;IEC61850 communication model;network status monitoring304|920|0更新时间：2024-06-05
Intelligent substation
- 摘要：Converged communication service is an important method for telecom operators to compete with OTT （over the top）internet application service.The critical issues of converged communication service commercial deployment were studied.The relation of converged communication service with traditional services was analyzed.The solutions of network deployment were discussed,and the problems of service opening and billing that should be taken into account were proposed.关键词：converged communication service;RCS;OTT;IMS288|833|0更新时间：2024-06-05
- 摘要：Smart grid interoperability is a kind of ability that a set of electrical equipments and systems exchange and share information safely,seamlessly and transparently with standard interface.The Grid Wise Architecture Council（GWAC）sponsors using concepts from capability maturity models in the software industry to smart grid interoperability and has been drafted an interoperability maturity model which is being in the project verification stage.The interoperability requirements of the smart grid and the work of the GWAC working group to promote interoperability maturity model（IMM）were analyzed.The evaluation and analysis of the maturity of the smart grid interoperability were studied and discussed.It would effectively help the development of smart grid planning from the dimensions of strategy and tactics to consider the interoperability of smart grid.关键词：smart grid;interoperability;maturity model;interoperability context-setting framework407|986|0更新时间：2024-06-05
- 摘要：With high speed,high penetration losses,multiple networks and multi-standard coverage levels,site plan is the key point of multi-operators coverage of high-speed rail.A multi-operators co-construction site plan by Chinatower was proposed by analyzing the limited coverage networks of operators,comparing overlapping switch area settings of various systems and investigating penetration losses of various trains.关键词：Chinatower;multi-operators;high-speed rail;co-construction;site479|867|0更新时间：2024-06-05
- 摘要：The contradiction between traffic demand and network bandwidth is the main problem of the current network.Traffic management is one of the effective solutions,at the same time it can improve the quality of service of the network,and network traffic identification is the basis of fine traffic management.The traffic identification method of network business based on multi-layer cascade algorithm was proposed,after the research of network traffic identification and machine learning techniques.This method can adapt to the situation of the complex network traffic flow,and can balance the contradiction between the time performance and the accuracy of the machine learning algorithm.Furthermore the cascade algorithm of this method takes the cost imbalance into account,and takes more attention to the identification of important business,so it can help enhance user experience.关键词：traffic identification;smart pipeline;multi-layer cascade algorithm;machine learning525|822|0更新时间：2024-06-05
- 摘要：The architecture of power optical transmission network simulation was proposed from the equipment layer,network layer and business layer for the target of communication support system for power grid control business,and the principle of SDH prototype simulation based on SSFNET was presented,and the design idea and implementation method of SDH device,network protection and recovery and associated alarm function was described in detail.Finally an example about the SDH communication topology of stable system in Northern Jiangsu Province was given,it realized the basic function of service bearer,fault alarm,channel recovery,route reconstruction,delay monitoring of power optical transmission network,which would provide quantitative analysis method for the communication network risk assessment,fault simulation,and the interaction effect of the power grid control system.关键词：SDH;SSFNET;simulation;power optical transmission network550|1149|0更新时间：2024-06-05
Other
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