最新刊期
卷 30 ， 期 1 ， 2014
- 摘要：The key technologies, standard evolution, industry chain development and its commercialization in the world of TD-LTE-Advanced were introduced from the point-view of the evolution of TD-SCDMA. The commercialization's propulsion to China IC industry development was analyzed, and the future development, technology and standard evolution beyond TD-LTE were discussed. It could be used as reference for research on TD-LTE, follow-up technology and standard evolution, such as 5G.关键词：TD-LTE;TD-LTE-Advanced;time division duplex;smart MIMO;interference coordination;synchronization;system;industry chain810|1392|0更新时间：2024-06-05
View the focus
- 摘要：The correlation studies mainly focus on the fields of elements design, physical layer communication, system planning and design on VLC network have not obtained enough attention yet. Therefore, the technical features of VLC and the typical network architecture were discussed, according to the evolution and development trend of the wireless communication system, some networking strategies for the indoor visible light networking were proposed, such as hierarchical cell coverage, control plane and user plane separation, distributed model and client-server model coexist in strategy. The key technologies of VLC system about the layout of lighting, network handover and access control were analyzed.关键词：visible light communication;indoor networking;hierarchical cover;control and user separation691|1611|0更新时间：2024-06-05
- 摘要：A kind of fine-grained security model for mobile data was proposed, tagged the mobile data and mobile applications in the intelligent terminal and the mobile access gateway/server, to control the operation of mobile data, and achieve the purpose of mobile data security isolation. Thus fine-grained security for mobile data management capabilities were achieved. The model was consisted of mobile data management module and the label control management module. The mobile data management module identified the user permissions and level of data privacy through the label to control the operation of mobile application of mobile data. The creating, modifying, storing and transmitting of the data label and application label were controlled and managed by the label control management module. Experiments on the Android device were carried out, and the security of the model was confirmed.关键词：fine-grained;mobile data;tag;data security728|976|0更新时间：2024-06-05
- 摘要：To deal with the increasing of computer clusters which the increasing needs of cloud computing brings and guarantee stability and reliability of the service, a cloud computing monitoring system based on OpenStack structure to satisfy the needs of cloud computing monitor was designed. The system structure and key technologies were described, including factory model, Paste Deploy, pipeline, Eventlent green thread and object-oriented SQL Alchemy model, so the system has modularity, layering and pipeline. The advantage of the system includes multi-function integrating, easy deploy, high expansibility and redeveloping easily. The experimental result proves that the system has high stability, accurate data acquisition and high integration with the third client, and it can implement cloud computing monitoring informatization more effectively.关键词：cloud computing monitoring;pipeline structure;eventlent green thread;SQL Alchemy;OpenStack730|1196|0更新时间：2024-06-05
- 摘要：With the development and popularization of information technology and intelligence device, the diversity of different device making forensic analysis of existing equipment cannot meet today's networking and storage technology requirements, and exhibit complex operation, low efficiency, on high speed disk image storage and massive data correlation. An efficient distributed forensics system based on Hadoop technique, which can support multiple concurrent media scene forensics work, was designed and implemented, and through the dispatch control services would be evidence of different data storage media to a different distributed data storage server, each forensic task runtime could monopolize a forensic medium to achieve a parallel multiple media forensic analysis. Data show that responsible acknowledge duration will be 0.1 s for a 2～4 GB text file.关键词：Hadoop;distributed system;forensic;massive data;multiple media684|1179|0更新时间：2024-06-05
- 摘要：With the rapid development of internet technology and the explosive growth of data, the storage system tightly coupled hardware and software design is limiting the development of storage technology severely, and unable to meet the rapidly changing needs in the mobile internet and big data era increasingly. Software defined storage as a new storage system architecture is more suitable for the development of the next-generation data centers. The SDS research status was described, started from the definition of SDS, and then SDS reference architecture combined with the SDS system requirements was proposed, finally the evolution of ideas were put forward.关键词：software defined storage;software defined data center;storage virtualization;architecture design742|2173|0更新时间：2024-06-05
- 摘要：Integrated access gateway northbound interface of Parlay X 2.0 interfaces were described in detail. The signaling procedures in Parlay X interfaces of value-added business platform were deeply analyzed and studied. It also took the MMS business processes as an example, which conducted CDR synthesis scheme in the Parlay interfaces service classification and process analysis with Hash indexing algorithm. The algorithm was tested and validated with capturing network data, which obtained good results.关键词：Parlay X;value-added service;Hash index;CDR synthesis554|926|0更新时间：2024-06-05
- 摘要：A joint power allocation and relay assignment algorithm for multi-pairs multi-relays two-way cooperative networks to improve system performance and decrease computation complexity was proposed. The proposed algorithm select best relays for each pair, then the selected relays use network coding to assist users exchanging signals. Meanwhile, this algorithm allocates power between all nodes participated in transmission under the total transmit power constraint.The expressions of bit error rate（BER）were derived in closed-form,and were verified by simulation. Numerical result shows that it has a performance improvement compared to the conventional equal power allocation scheme.关键词：multi-pairs multi-relays two-way channel;decode-and-forward;relay assignment;power allocation;end-to-end bit error rate535|696|0更新时间：2024-06-05
- 摘要：With the rapid development of information technology, the ubiquitous sensor network, high-speed communication network, and the high performance distributed computing system have been commonly implemented. The massive data, which is generated anytime, with the mass storage, heterogeneous structure, and requiring on-time process, is bringing our society into the age of big data. The electricity big data includes the information of production, transportation, marketing, enterprise operation and management in the electricity power enterprise. Therefore, how to collect, transfer, store, and analyze the big data so as to conduct the production, and serve the electricity end users turns to an important research subject for the power industry. An overview was given about the features of the age of big data from three aspects: the definition, development trend, and the key technology of big data. Then, a summary of the research and typical application of the existing big data technology in the electric power industry was described. Finally, the challenges of big data technology in the future for the electric power information were concluded.关键词：big data;electric power information;smart grid;data mining1317|4536|0更新时间：2024-06-05
- 摘要：When cycle-slip occurs in BPSK modulation system, sign of information sequence which is input of LDPC decoder is opposite to the original one. This problem will lead to decoder failure. Anti-cycle-slip LDPC decoding algorithm based on belief propagation was proposed. Modified algorithm modifies initial likelihood ratio information according to information between check nodes and variable nodes by an iterative decoding computation. Modified algorithm can eliminate the influence of cycle-slip and ensure normal function of LDPC decoder. Simulation result shows that modified decoding algorithm has the same performance with traditional decoding algorithm without cycle-slip, which means that the modification of initial likelihood ratio doesn't lead to decoding performance loss. When cycle-slip happens, traditional decoding algorithm fails. Decoding LDPC of odd check node degree by anti-cycle-slip algorithm will overcome the impact of cycle-slip totally. Modified algorithm has the same decoding performance no mater cycle-slip happens.关键词：low-density parity-check code;cycle-slip;BPSK;belief propagation decoding425|989|0更新时间：2024-06-05
Research and development
- 摘要：Cooperative spectrum sensing is the core of cognitive radio technologies to utilize spectrum resources effectively. However, cooperative spectrum sensing schemes are vulnerable to abuses by false sensing data, and thus offering opportunities for malicious users. By launching the spectrum sensing data falsification attack, some of them can make a well cognitive radio system useless. To further understand the SSDF attack and its current research situation and development trend, the types of SSDF attack were analyzed in the form of three aspects, and several typical security methods were concluded. Meanwhile, the current problems of SSDF attack and research trends in this area were discussed.关键词：cognitive radio;cooperative spectrum sensing;wireless communication;spectrum sensing data falsification attack370|841|0更新时间：2024-06-05
- 摘要：Small cell network is a multi-layer cell network formed by low-power nodes whose base stations transmit power is lower than conventional macrocell base stations. More and more industry attention is pained to the development of small cell which is considered as an important part of LTE-Advanced technology study. The performance of a variety of mobile state estimation scheme in mobility management was analyzed and evaluated and the same work was done on the protection scheme of the switching instruction involved in a cellular switch. A summary was made about challenge and future research directions of small cell mobility management finally.关键词：small cell;LTE-Advanced;mobility enhancement;mobility state estimation;handover265|404|0更新时间：2024-06-05
review
- 摘要：In recent years, there is a rapid growth of malware on operators network. It severely threats security of mobile internet. Based on reviewing of existing malware protection technologies, mobile malware protection architecture including both network side and terminal side technology and their interaction mechanism was proposed. Some key implementation technologies for engineer's reference were also studied.关键词：mobile internet security;malware;dynamic detection;static detection293|915|0更新时间：2024-06-05
- 摘要：The development of worldwide LTE operators and the business support capabilities of LTE network were described and several business and business model innovation directions were summarized, including tariff changes, OTT competing, big data traffic management and information push with rich media, and so on. Finally, the evolution demand of the business platform in the future was presented.关键词：LTE;over the top;big data223|756|0更新时间：2024-06-05
- 摘要：Since the advent of OpenFlow, SDN technology research institutions at home and abroad have invested a great deal of research effort, such as the deployment of fully controllable and customizable network experiment platform. The programmable routing technology virtualization and the hardware devices of OpenFlow network have made certain progress. The OpenFlow technology research results based on the network virtualization field related were reviewed and compared briefly with the NFV technology. Else, a prospect of the OpenFlow technology application in the future research field and research direction was put forward.关键词：OpenFlow;software defined network;network virtualization;network experiment platform;network operating system;network functions uirtualiztion292|1138|0更新时间：2024-06-05
- 摘要：According to the research of enterprise customer electronic channels based on different scene modes, the development of electronic channels for enterprise customers and the applications in telecom carriers were analyzed. The situation with the inter industry were compared, and the development and application mode of scenario-based electronic channels for enterprise customers was put forward.关键词：enterprise customer;electronic channel;scenario-based mode306|2419|0更新时间：2024-06-05
- 摘要：Aiming at the effects on network performance of terminal user perception, a kind of high efficient positioning terminal performance issues called five steps was put forward, and through the real log data billed experiment, the effectiveness and efficiency of this method was verified. Theoretical analysis and experimental results show that, the “five steps”save the multifarious dimension analysis, and it has the advantages such as simple and clear, strong objectivity, low computing duplication, strong practicability, and so on. Expanding the system after the flat design can be billed in the data type, in order to meet the different needs of the business.关键词：five steps;terminal problem location;multi-dimensional;user perception220|521|0更新时间：2024-06-05
- 摘要：Power dispatching internal network contains of a large amount of safety equipments, but lacks of centralized monitoring, statistical analyzing and unified managing tool. A platform for monitoring the security of electric power dispatching internal network was constructed. The platform acquires realtime security equipments operating status, alarms, and logs information, through standardized data processing, analysis and calculation, to achieve centralized monitoring, integrated alarm, hidden danger reminder, statistical analysis, report generation and decision functions.关键词：power dispatch;internal network;security protection;centralized monitoring244|848|0更新时间：2024-06-05
- 摘要：Abastract:Along with the mobile application of the increasingly rich, especially widely used as WeChat, QQ and Weibo, the wireless network air interface signaling resource consumption issues highlighted, while the terminal energy consumption. Based on the analysis of the same industry solution, a new no heartbeat solution which can still maintain a mobile application always online was proposed, the wireless command consumption problem was solved.关键词：always online mobile application;heartbeat;signaling storm257|718|0更新时间：2024-06-05
- 摘要：As the scale of e-Commerce users and individual demand is increasing, the existing framework of e-Commerce has been unable to provide users with a complete solution. First the e-Commerce network architecture was put forward, and a detailed discussion was made on each part of the network architecture, a kind of smart dynamic domain name system and the optimal routing method of user access of e-Commerce were designed, at last the user access to electronic commerce exchange process was given.关键词：DNS;e-Commerce;network deployment244|566|0更新时间：2024-06-05
- 摘要：Based on the analysis of the characteristic of customer classification theory, the current mainstream webpage classification technology was summarized, and common mining algorithms and applicable scene of customer classification were deeply analyzed. Finally, the classification process of customer characteristic was discussed to provide practical reference for developing customer feature classification work under mobile internet.关键词：customer characteristic;webpage classification;data mining885|1015|0更新时间：2024-06-05
- 摘要：The data quality management platform was designed and constructed while the data center was building, which could help to realize scientific and effective data management and quality control. In addition, the trusted data could provide reliable decision support for decision makers. Based on these systems, it was further analyzed that how to build a set of quality management system from two aspects, such as information technology and management control. With the help of reliable data and quality analysis system, the quality of enterprise data was significantly improved, and the accurate scientific data was ensured to be provided by data center systems.关键词：data center system;data quality management platform;data warehouse;data mart703|865|0更新时间：2024-06-05
- 摘要：In order to meet the current demands of building information security, while ensuring existing business systems available, based on information technology to achieve the goal of building security system, the existing network deployment structure system access mode, user habits of Guodian Chengdu Jintang Generation Co., Ltd., on behalf of units of power generation enterprises, were analyzed. Based on this analysis, a five-level business system, as the network management, border security protection, mobile access security, host security, application security, was designed for power generation enterprise security reinforcement. By introducing the construction process of advanced security system of Guodian Chengdu Jintang Generation Co., Ltd., the references were provided for other power generation enterprise information safety construction.关键词：identity authentication;network management;security protection;data leak;terminal check257|540|0更新时间：2024-06-05
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