最新刊期
卷 31 ， 期 1 ， 2015
- 摘要：Comprehensive analysis on global and disruptive impacts to telecom industry due to SDN development from strategic vision was made. It was started from the introduction on meaning and similarity and difference of SDN and NFV. Comparison on basic characteristics between telecom industry and information industry was made and exploration and lessons of telecom industry before SDN were analyzed. In the following part, fundamental problems of existing networks and major driving forces for SDN development were investigated. Next basic characteristics and five key values of SDN and application prospect were described. Finally major challenges for SDN development were presented and key points of thinking on SDN from strategic vision were summarized.关键词：SDN;NFV;transformation;innovation805|1651|0更新时间：2024-06-05
View the focus
- 摘要：Recommending micro-blogs to users whom are interested in is an important way to improve the user's experience. In order to make the recommended micro-blog more match user's interests and tastes, a micro-blog recommendation method was proposed. The method considers not only user's own characteristics, but also the evaluation from the user's community. In technology, vector machine（SVM）was supported for text classification to discover user interests, and through multidimensional Newman algorithm to discover user's community. This community will be regarded as the recommendation trust domain. Finally, the improved collaborative filtering algorithm was used. It integrated user's interests and recommendation trust domain to recommend micro-blog, in order to improve the quality of micro-blog recommendation. The experimental results show that, the micro-blog recommendation method is practical and effective.关键词：micro-blog recommendation;collaborative filtering;recommendation trust domain;user interest discovery745|1173|0更新时间：2024-06-05
- 摘要：To stimulate the DTN selfish nodes to cooperatively forward messages when the buffer was limited, a congestion-aware incentive scheme based on double auction for DTN was proposed. In the scheme, nodes determined the self congestion degree according to the current free buffer and message receiving rate. Combining the message delivery probability and congestion degree, nodes traded the message based on double auction model, thereby achieved the cooperation between nodes. Extensive simulations were carried out on real-world traces to evaluate the proposed scheme. The experimental results show that, due to the congestion aware, the incentive scheme can further stimulate selfish nodes to cooperatively forward messages, improve the message delivery ratio and reduce the message delivery delay.关键词：delay tolerant network;selfish;incentive;double auction;congestion615|949|0更新时间：2024-06-05
- 摘要：With the development of the telecommunications technology, telephone call network almost covered the whole society; the huge social network presents tremendous opportunities for telecommunication companies. Especially in the increasing fierce market competition, more and more telecommunication companies are concerned on maintaining customer relationship, mining customer potential value and marketing suitable target customers. The distribute and stand-alone graph computing frameworks and tools were researched for mining large-scale social network graph data like telecommunication network, and at the end the feasibility and usability of Graphchi in large-scale graph datasets were verified and a graph mining application was made with telecommunication data using stand-alone graph data processing tool—Graphchi.关键词：telecommunication graph data;large-scale graph data mining;Graphchi849|1684|0更新时间：2024-06-05
- 摘要：In order to reduce the intra coding complexity of HEVC, a fast block partitioning algorithm based on spatial correlation and image texture was proposed. Firstly, a concept of most possible depth range（MPDR）was proposed according to the correlation analysis of adjacent CTU depth range. Secondly, the difference between the current CTU texture and neighboring CTU texture was analyzed by detecting the dominant edge direction. According to the texture difference, the depth range of the current CTU was chose from MPDR and the origin range 0～3. Finally, a formula for texture complex threshold was formed by statistical calculation. Before CU coding, detect the texture complexity of the current CU by comparing the pixel variance and threshold, determine whether or not to skip the current unit coding calculation. Compared with HM13.0, experimental results reveal that the proposed algorithm can save about 20% computational complexity on average whereas the average bit rate increment is 0.84% and the decrement of PSNR is 0.04 dB.关键词：high efficiency video coding;fast block partitioning;spatial correlation;most possible depth range;texture difference;texture complexity690|1341|0更新时间：2024-06-05
- 摘要：In order to realize multiple-access communication of direct sequence spread spectrum extended binary phase shift keying（DS-SS/EBPSK）modulation, a realization method based on code-division was researched. Firstly, based on the analysis of DS-SS/EBPSK modulation signal, the effective spread spectrum sequence which can be used for dispreading and code division multiple-access was obtained by formulizing the DS-SS/EBPSK modulation process. Then, the correlation receiver for DS-SS/EBPSK modulation signal detection was designed and the multiple-access transmission was realized by making use of the small-scale cross-correlation of different spread spectrum sequences. Finally, take m sequence for example, the relationship between bit error rate（BER） performance of the expected user and the number of users was simulated, so did the relationship between BER performance of the expected user and the cycle length of m sequence. The simulation results demonstrate the feasibility of the code-division multiple-access realization method and indicate that the interference degree depends on the cross-correlation of the spread spectrum sequences.关键词：extended binary phase shift keying;direct sequence spread spectrum;code division multiple access;m;sequence466|668|0更新时间：2024-06-05
- 摘要：Secure transactions among P2P peers are critical for system stability. Considering existing security breaches, a private cloud assistant trust model for P2P session negotiation and connection was proposed. With a few characteristics during computing and storage process（e.g. high efficiency, security, neutrality）, private cloud platform is capable to provide trustworthiness calculation, storage and evaluation for each peer in P2P network. Some coping mechanisms were proposed to curb malicious behaviors, such as low quality services, false recommendation and strategic fraud attaches. Simulation result shows that the proposed model has feasibility, efficiency and dynamic adaptability.关键词：P2P;private cloud;trust evaluation;subjective380|1093|0更新时间：2024-06-05
- 摘要：The bit energy of chaotic signals in DCSK system is not stable,which will cause the estimation interference and the bit error rate decline. At the same time, the system's transmission rate is lower and the security is poorer compared with other system. In order to solve these problems, a novel FM-DCSK secure communication system was proposed which was combined the FM modulation with the modified DCSK system.The bit energy of signals remained stable by using FM modulation so that the BER performance in such system can be improved. Meanwhile, the system was also combined with the modified DCSK system which uses two-channel scheme, therefore it can improve the transmission efficiency and further improve the security performance. Finally, the theoretical analysis and the simulation results prove that the relative performance in this proposed system can be greatly improved.关键词：chaos secure communication;FM modulation;novel FM-DCSK319|952|0更新时间：2024-06-05
- 摘要：According to the characteristics of M/M/1 model and production features of customer request service in the wireless mesh network, a gateway queuing model in wireless mesh network based on M/M/1 model was constructed. The model puts the original disorder state sets in request service into order sets and it was queued at the gateway node. As a single service platform, gateway services in the whole collection. Then, to solve the model by using the mathematical method, the network system key parameters and target analysis function were derived. Finally, through verification experiment, the proposed model can obtain better network parameters in the network of non-saturated resource allocation. The theory analysis and experimental results show that the proposed model is reasonable and effective.关键词：wireless mesh network;gateway;optimal;performance analysis481|897|0更新时间：2024-06-05
- 摘要：An energy-efficient virtual machine（VM）migration and consolidation algorithm with multi-resource was proposed. The algorithm was developed based on a multi-resource energy efficiency model. A method of multi-resource utilization double threshold was designed to trigger migration of virtual machine, and the optical particle swarm optimization method was introduced in the consolidation of virtual machine. Compared with traditional heuristic algorithms, the algorithm reduces the number of active physical nodes and the amount of VM's migration effectively, and obtains better energy efficiency in cloud data center.关键词：cloud data center;energy efficiency;virtual machine;migration and consolidation396|952|0更新时间：2024-06-05
- 摘要：Aimed at the application problem of timing synchronization algorithm in orthogonal frequency division multiplexing system, an improved algorithm for TD-LTE downlink time synchronization was proposed. It utilizes statistical energy difference and correlation of cyclic prefix to improve the system performance, which reduces the computational complexity, and can detect the cyclic prefix types. The simulation results demonstrate that the performance of the new method is excellent in multi-path fading channels, especially in the case of small SNR. And it is robust against the normalized frequency offset and Doppler shift.关键词：TD-LTE;cyclic prefix;downlink;timing synchronization466|660|0更新时间：2024-06-05
- 摘要：An efficient and secure mechanism to partition computations across public and private machines in a hybrid cloud setting was explored. Aiming at the restrictions in different levels for public cloud usage, the optimal risk-aware workload distribution problem was formalized as a mechanism for workload response time minimization. A dynamic programming approach that results in an optimal distribution of the query workload was proposed, which that searches for an optimal computation and data partitioning scheme given a query workload and public cloud usage boundaries（resource allocation cost and sensitive data disclosure）. Finally, the performance of the dynamic programming approach was evaluated. Experimental results show that the proposed scheme can lead to a major performance gain by exploiting both the hybrid cloud components without violating any pre-determined public cloud usage constraints.关键词：hybrid cloud;workload;response time;query;dynamic programming344|666|0更新时间：2024-06-05
- 摘要：Traditional 2D active antenna system can only carry on horizontal beam steering in cellular mobile radio system. The existing 3D active antenna system based cellular network can obtain large throughput gain with the use of vertical beam steering. The existing beam downtilt selection method for 3D active antenna system is based on the information of pitch angle. The received power of the user is very low. A novel beam downtilt selection method for 3D active antenna system was proposed to improve the received power, which is based on the received reference signal power. Simulation results show that the proposed method can improve the average throughput of the cell and the system performance sharply.关键词：three-dimensional active antenna;vertical beam steering;beam downtilt;throughput362|983|0更新时间：2024-06-05
- 摘要：To deal with the interference between macro cell and pico cell, or between pico cell themselves in LTE-Advanced heterogeneous network, joint algorithm of component carrier selection and beamforming was proposed. By shutting down a subset of the component carrier in the dense low power node deployment scenario,it could remove lots of interference at the receive side. Additionally, based on utility function and calculate separately, algorithm reduced the dimensions and the searching complexity of the algorithm. Simulation results show that the proposed scheme can bring a great throughput gain of edge users and the whole system in the heterogeneous network.关键词：heterogeneous network;carrier aggregation;beamforming;inter-cell interference coordination520|193|0更新时间：2024-06-05
- 摘要：An improved subcarrier and power allocation algorithms based on differential evolution algorithm was proposed for the adaptive resource allocation problem of multiuser orthogonal frequency division multiplexing. Subcarrier allocation was first implemented to distribute the total power uniformly on each subcarrier. Then via adding the step of detecting and improving constraints to improve the differential evolution algorithm and using it to achieve power allocation with a fitness function of the user's fairness and system capacity. Computer simulation results show that the proposed algorithm can achieve high improvement of the system capacity under low complexity and maintaining the fairness among users, the effectiveness of the algorithm was verified.关键词：multiuser orthogonal frequency division multiplexing;adaptive resource allocation;differential evolution;algorithm327|684|0更新时间：2024-06-05
- 摘要：The spatial correlation of 3D MIMO arrays was investigated. First, the accurate channel model for 3D-MIMO in global coordinate system was presented. Based on the channel model, the closed-form formula of spatial correlation coefficient for different array position under Laplace power angle spectrum（PAS）distribution was derived. Finally, three examples were provided to confirm the validity of our analysis, and the reasons for generating spatial correlation were obtained.关键词：3D-MIMO;spatial correlation;wireless channel model563|1466|0更新时间：2024-06-05
research and development
- 摘要：Based on the analysis of the traditional cellular structure of the radio access network（RAN）which is facing more and more challenges, the development trend and demand of current mobile communication system were introduced, and the research goal and requirement for the fifth generation mobile communication system（5G）were analyzed. Aiming at solving this problem, a new type of radio access network architecture based on C-RAN was proposed. Moreover, the potential key technologies were illustrated in detail, including UDN, virtualization（software defined network and network function virtualization）, CDN and green communication. Those provide reference for 5G access network architecture research.关键词：radio access network;5G;C-RAN;ultra-dense network;virtualization;content distribution network;green communication708|658|0更新时间：2024-06-05
- 摘要：The photonic integrated circuits（PIC）are main trend of optical components. The developments of PIC on both technology and industry perspectives were studied, then challenges and future application prospects of PIC were discussed. Finally, the strategies of PIC developments in China were proposed.关键词：photonic integrated circuit;optical component;optical communication682|2605|0更新时间：2024-06-05
summarize
- 摘要：The issues of investments on mobile network and its coverage affected by different wireless spectrum was studied, with the importance and desirability of frequency re-farming being analyzed systematically in reference to the current spectrum resource allocation and development status of mobile services in China. The value brought by frequency re-farming was explored from the perspective of cooperative networking and mobile network deployment, as the implementation strategy of frequency re-farming was proposed.关键词：mobile communication;frequency re-farming;spectrum efficiency;network coverage;investment benefit702|1585|0更新时间：2024-06-05
- 摘要：According to the data acquisition and the modeling problem of telecom operators facing in the construction of EDC, the data status and data characteristics in the OSS was analyzed, a modeling method of hierarchical classification of combing theory and data model management idea were proposed, the unification of OSS data collection, sharing the modeling and data concentration were realized. Through the application of end to end analysis on mobile internet terminal as case subject,it provides reference for the construction on telecom industry EDC.关键词：EDC;ETL;OSS;data acquisition;Hadoop547|1311|0更新时间：2024-06-05
- 摘要：The major factor affecting the EGSM network performance is the same frequency external interference from CDMA of other country in the border areas. A case which EGSM operator subject to a wide range of strong external interference by same frequency of neighbor country CDMA operators was analyzed, then a solution to reduce this external interference was proposed. Firstly, with KPI statistical and DT test analyze, the external interference source was located, and the intensity and scope of the effects also was confirmed. Then, using the rural Hata propagation model theoretically, the impact and scope of CDMA interference was analyzed; combined with the respiratory effects of CDMA network, the differences between day and night EGSM external interference were analyzed. Final, the solution was proposed, which use deviate cell of border to carry traffic, use the clean frequency band to plan or use the 1 800 MHz frequency to carry the traffic. Those solution weakened external interference, the KPI and user effecting of EGSM network has achieved good results.关键词：CDMA;external interference;respiratory effect;Hata propagate module290|761|0更新时间：2024-06-05
- 摘要：The characteristics of external and internal popularity of streaming media and the relationship of external popularity and the number of cache replacement were analyzed. Respecting the characteristics that cache replacements are focus on a small rang of popularity, a segmentation method based on popularity classifying of streaming media, which uses smaller segments on videos replaced frequently and bigger segments on the other videos, was proposed. The experimental result shows that the segmentation method can effectively reduce the number of segments compared with the uniform segmentation method under the same conditions of the byte hit ratio.关键词：popularity;segmentation;streaming media428|264|0更新时间：2024-06-05
- 摘要：The LTE provides voice services for users by CSFB technology. The MTRF function can solve the problems that unsuccessful circuit switched fallback on the edge of CSFB. The deployment of MTRF function involves the range of network remake. By analyzed the problem of unsuccessful circuit switched fallback on the edge of CSFB and studied the principle of MTRF, two deployment proposal were provided. They could be used in different scales of networks. The results could be provided a reference for the follow -up network construction.关键词：long term evolution;circuit switched fallback;mobile terminating roaming forwarding453|941|0更新时间：2024-06-05
- 摘要：By analyzing the technology evolution of IPv6 in the deployment of IPng, indicate the difficulties to CP in large-scale deployment of IPv6 terminals. Combined with HG's key role in IPv6 network construction, the technical principle of HG was analyzed, the technical advantages of routing HG in large-scale deployment of IPv6 terminals were explained, and an implementable scheme was proposed to help CP, and the whole industry, to speed up the scale deployment of IPv6.关键词：IPv6;scale deployment;home gateway;routing428|1172|0更新时间：2024-06-05
- 摘要：With the development of the information communication network equipment functions and business services, intensive management of the information communication network is gradually turning into a new management model. The influencing factors of management span planning were discussed based on flatting centralized monitoring and hierarchical fault management. The functional mechanism, announcements, strategies and methods were discussed from the six fault management aspects（equipment alarm obtaining, alarm standardized management, alarm rules and analysis, fault work order pretreatment, channel optimization and contingency plan， process through and quality control）. The engineering practical value and management supporting values of emerging technology were analyzed in centralized fault management,such as big data technology,virtualization technology,etc.关键词：information communication network;management span;centralized monitoring management;centralized;fault management, alarm management;worksheet management443|1179|0更新时间：2024-06-05
- 摘要：By studying the automatic verification analysis techniques of network security domain, a secure domain topology automatically restore and security domains devices interconnected relations, security domain boundaries and border access control policy automatic verification were achieved. Through automation, normalization and processes curing methods, violations of the security domain provisions of the act were detected. It ensures border access control policy is minimized and network security domain is divided continued compliance, reduces the risks associated with the security domain management.关键词：security domain;compliance;access control policy451|144|0更新时间：2024-06-05
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