最新刊期
卷 30 ， 期 8 ， 2014
- 摘要：Telecommunications transport networks carry aggregated communications information transparently, reliably and efficiently,supporting a full range of communications service provider（CSP）services and service networking layers （IP,Ethernet,ATM,TDM,etc.）. While optical-specific technology advances will continue to be essential for continued scalability and cost/bit advances,it is asserted here that a combination of external drivers will have the greatest impact on shaping the form of the next generation of transport networks. The converging drivers for change were discussed, a vision of how the broader network architecture as well as transport networks change was laid out, and the changing network attributes and technology directions central to this transformation were illustrated.关键词：next generation of transport network;network function virtualization;content delivery network;software defined networking1060|1452|0更新时间：2024-06-05
Viewpoint focusing
- 摘要：The cloud network is the trend of the telecom world now. As the key technology, SDN and NFV get so much attention from everyone. Not only the standard organization but also the other stakeholders do many contributions to the development of SDN/NFV. Opposite to its rapid steps, SDN/NFV still have to face some challenges, such as the security, interoperation and performance issue, which should be the new technical focus.关键词：software defined networking;network function virtualization;orchestration1528|2777|0更新时间：2024-06-05
- 摘要：In order to meet the requirement of continued growth in broadband services and applications, optical networks need to be more and more flexible and controllable. Software defined optical network（SDON）focuses on an integrated optical networking solution based on software defined technology, and the key technologies are related to software-defined optical transmission, switching and networking, etc. Based on the analysis of technological characteristics of SDON, the necessity and feasibility of introducing SDON were discussed, and several application scenarios of SDON were proposed. All these show that SDON will play an important role in the development process of next-generation intelligent optical networks forwards to high efficiency, flexible scheduling, and virtual reconstruction.关键词：software defined optical network;data center;virtualization;unified control1373|1838|0更新时间：2024-06-05
- 摘要：The entire industry is in the period of dramatic change. Flexibility, scalability, simplicity are the basic features of future network. Customer-defined virtualized network with quality guaranty, is the key service in future network. To fulfill that, SDN and NFV seem like to be the most appreciate solution. Several SDN and NFV scenarios according to the development of relative technologies were proposed. Besides, China Mobile's thoughts and practices were introduced.关键词：software defined networking;network function virtualization;application scenario1205|2121|0更新时间：2024-06-05
- 摘要：Firstly three phases of the development of inter-domain SDN internetworking were discussed, then a cooperation based inter-domain SDN technology WE-Bridge was introduced. Finally, an inter-continental inter-domain SDN testbed based on WE-Bridge technology was introduced.关键词：software defined networking;inter-domain SDN;WE-Bridge1173|1219|0更新时间：2024-06-05
- 摘要：Along with rapid growth of mobile internet, cloud computing and other new services, on the one hand, the traditional IDC is being transformed to cloud computing data center, on the other hand, more and more applications and data are coming to be carried on the cloud, which makes the scale of cloud data centers substantially increase, while the traditional network architecture and the technologies has been difficult to adapt to the development of the cloud data center. As a recent rising new network technology, SDN is considered to be an important mean to solve many network problems of cloud data center. Major challenges and problems of data center network were analyzed after introducing cloud computing and then proposals to solve them were given. After comparing several classic SDN technologies, the solution of cloud data center network based on overlay SDN was proposed, and its implementation principle was deeply analyzed. Finally, the development trend of the cloud data center network was discussed.关键词：software defined networking;network virtualization;multi-tenant network;cloud computing;cloud DC1243|2011|0更新时间：2024-06-05
- 摘要：Scenarios of virtualized core network were analyzed firstly, then virtualized core network architecture and related key technologies were discussed. Finally, the core network virtualization processes and procedures were forecasted.关键词：communication network technology;virtualized network;core network1007|1240|0更新时间：2024-06-05
Topics: SDN and NFV
- 摘要：Microwave photonics（MWP）uses the strength of photonic techniques to generate, transfer, process, control and networking for broadband microwave signals. Some notable challenges were analyzed to apply dynamic reconfigurable intelligent microwave photonics network. By integrating specific wireless cellular system with fiber access network, some key technologies such as link transfer, signal processing, system modeling and design, etc were discussed. And some experimental research works of the proposed network were reported, then the experiment results were analyzed. In the end, the future application directions in dynamic reconfigurable intelligent microwave photonics network were pointed out.关键词：microwave photonics;broadband;dynamic reconfigurable;optical wireless convergence1107|1838|0更新时间：2024-06-05
- 摘要：To effectively improve the throughput performance of secondary user in cognitive networks, a dual threshold based opportunistic spectrum access policy was proposed, which could be implemented under the condition that secondary user had non-ideal spectrum sensing capability. The proposed policy can take both channel quality information of secondary user and the inaccurate channel occupation information into account, to make secondary user access the channel in sensed idle and busy states with different channel quality thresholds. Based on this, the throughput performance of secondary user can be improved significantly by utilizing the transmission opportunities with good channel quality. With this policy, an optimization problem maximizing the effective throughput of secondary user with interference constraint for protecting primary user was formulated, and the optimal channel quality thresholds were derived under non-ideal spectrum sensing. Simulation results demonstrate the effective throughput performance of secondary user with non-ideal spectrum sensing capability can be improved significantly by implementing the proposed dual threshold based opportunistic spectrum access policy.关键词：non-ideal spectrum sensing;dual threshold;opportunistic spectrum access;channel quality752|811|0更新时间：2024-06-05
- 摘要：The current technical approaches of wireless charging devices and international existing wireless charging standard were analyzed. Then, the electromagnetic compatibility for wireless charging case management in Europe, America, Korea and Japan was discussed and explored. Hereafter, the domestic classification methods and testing standards of information technology equipment, short-range radio devices and ISM equipment were researched. Finally, the following wireless charging devices electromagnetic compatibility testing proposals were obtained:wireless charging equipment classification attribution recommendation in domestic existing testing standard, domestic wireless charging device electromagnetic testing methods recommendation, wireless charging device management recommendations.关键词：wireless charging device;EMC;testing standard793|1673|0更新时间：2024-06-05
- 摘要：For the QoS of VoIP system, integrating the service based mechanism of network policy control within 3GPP IMS into QoS of VoIP, the SIP was adopted as signaling protocol. The function architecture with QoS capabilities and model of layered QoS control was proposed. Based on the investigation of QoS calling control process, a SIP delegate, feature requirement of UE and router with QoS information were introduced. The module armed with policy decision ability was created. The QoS interacting messages between interfaces of all modules were studied. Through utilizing the suggested mechanism in QoS modules and prototype of VoIP SIP-QoS delegating server, feasibility and availability were validated.关键词：VoIP;NGN;QoS;SIP690|908|0更新时间：2024-06-05
- 摘要：Device-to-device（D2D）communication underlaying cellular networks can bring great benefits to spectrum resource utilization and users' throughput. However, because of the interference caused by D2D communication, interference cancellation and coordination becomes very important. A joint mode selection and resource allocation scheme was proposed to improve the performance of system in the downlink direction. Simulation results show that, compared to pure greed D2D scheme and cellular scheme, the proposed scheme can achieve higher system throughput.关键词：D2D communication;cellular network;mode selection;resource allocation;interference coordination801|1070|0更新时间：2024-06-05
- 摘要：With the coming of mobile internet, the trend of traditional communication industry has become decentralized, clustering, ecological, and“open platform”has been irreversible. Emerging industrial power, such as terminal producers and internet companies, has gained the first mover advantage in the control of the mobile internet industry chain by using the open platform. In order to help telecom operators to insure and reconfigure the discourse power, the ecological system of open platform and the third party service market were studied, and the strategy and suggestion for telecom operators to build open platform were put forward.关键词：open platform;ecological system;third party service market736|1400|0更新时间：2024-06-05
- 摘要：Most existing blind equalization algorithms rely on partial or complete channel identification, but the channel order estimation is always a difficult task. Higher order normalized cumulant analysis was applied to the blind equalization, and a new sixth-second order normalized cumulant blind equalization algorithm based on oversampling was proposed. The proposed method recovered the transmitted sequence adopting optimization algorithm of sixth-second order normalized cumulant without channel identification and channel order estimation. Simulation results show the algorithm's effectiveness.关键词：blind equalization;oversampling;sixth-second order;normalized cumulant630|1065|0更新时间：2024-06-05
- 摘要：Single carrier frequency domain equalization（SC-FDE）is widely recognized as an very promising technique for its lower peak-to-average power ratio, but it also needs more accurate channel estimation method. A low complexity two-dimensional MMSE channel estimation algorithm based on time-frequency domain separation feature of channel was proposed in order to improve estimation performance and predigest the complexity. The two-dimensional MMSE estimation can be simplified as two one-dimensional MMSE and the SVD algorithm was used to reduce the complexity of one-dimensional estimation. The UW as the cyclic prefix could reduce the overhead of system. Noise variance was also estimated at the UW. The simulation results show that the proposed algorithm has better performance than the conventional LS algorithm and MMSE algorithm. The complexity of the proposed algorithm was also lower than the conventional one-dimensional MMSE method.关键词：single carrier frequency domain equalization;SVD;channel estimation;unique word653|1003|0更新时间：2024-06-05
research and development
- 摘要：The integration network of 5G and Wi-Fi can well solve the problem of rapid growing wireless traffic and user experience pursuit in 5G. Integration of multi-radio access technology, multiple needs and multiple internet were studied to become the inevitable trend for IMT 2020（5G）. In the networking of 5G and Wi-Fi, integration of network application scene and fusion networking technology were introduced to be the inevitable demand, no-sense authentication, network security, green communication were proposed to become the key technical indicators.关键词：5G;Wi-Fi;integration;no-sense authentication;green communication1035|2545|0更新时间：2024-06-05
Overview
- 摘要：Beginning with Fourier Law and dealing with centralized and dispersive heat source in server with their merits, the architecture named parallel double-channels was proposed, which consist of “contact-type”and“non-contact-type”channels with significant difference on thermal resistance, and use the “heat pipe water cooling unit + cooling tower”contact-type-cooling-channel to remove the thermal current from the key-chips in server with high efficient. The verification experiment was organized,“the customized server with double-channels-cooling”was developed, and according to the experiment result, it is feasible to realize contact-type-cooling on the CPU in servers with natural cold source.关键词：double-channels-cooling;heat pipe;water-cooling;internet data center;45℃;server;CPU688|1177|0更新时间：2024-06-05
- 摘要：After the introduction of the trends of ICT for enterprise and residential subscribers, the problems and challenges of current ICT solutions were also analyzed. Based on comparison between different patterns of ICT solution, LSN（local service node）, a new ICT service oriented architecture was proposed to telecom carriers. The architecture leverages the telecom optical broadband access network, and by using large layer 2 technology, enterprise/residential CPN were integrated inherently with nearby LSN data centers which were built on cloud computing, NFV and SDN technologies. The new infrastructure was composed of CPN, telecom broadband access networks and LSN cloud data centers. The implementation of such an infrastructure was also presented. Some new use cases were presented too, to show the benefits of the new architecture.关键词：cloud computing;LL2;CAXE;ICT;NFV;SDN;SMAC;VxLAN;local service node913|1777|0更新时间：2024-06-05
- 摘要：The rapid development of internet technology, especially the developed of Web 2.0 which has the main feature of personality, making a lot of information in front of people at the same time. The value of personalized recommendation technology has become increasingly prominent. A design of personalized recommender system adapting to different business was presented, including the collection and analysis of user's all explicit and implicit behavior, using user behavior profiles and entropy method to determine the weight of the behavior for analyzing user interest, the introduction of time forgetting function to solve the problem of user interest drift, and getting a list of the user's personalized recommendation based on collaborative filtering technology. Finally, the system test assessment analysis based on the actual data was provided.关键词：personalized recommender system;user interest analysis;entropy;interest drift;collaborative filtering697|911|0更新时间：2024-06-05
- 摘要：Traditional IPng solution——IPv6, extends the address space by extending the length of the address laterally. Thus it's incompatible with IPv4 and difficult to promote. A new solution: reuse the IP addresses by extending the protocol stack longitudinally was presented. In this way, it can not only get very big address space, but also have very good compatibility with current IPv4 network. So the upgrade has minimal impact, requires a minimum investment, and can be quickly deployed.关键词：internet;IP-the next generation;IPv4;IPv6;double-network-layer649|1042|0更新时间：2024-06-05
- 摘要：The characteristics of the small and medium-sized manufacturing enterprises information system in China were analyzed. Combined with the“cloud manufacture”technology and service concept, an intelligence information service based on cloud model was introduced. The overall system architecture of manufacturing resources layer, the network layer, the virtual service layer, the core service layer and the wisdom application layer were put forward. Also the virtual service mechanism and service delivery methods were explained.关键词：small and medium-sized manufacturing enterprise;cloud computing;intelligence information service;cloud manufacture658|977|0更新时间：2024-06-05
- 摘要：Along with large-scale FTTx access network construction and massive users upgrade from DSL to FTTx, bundling between user account and access equipment physical port is an important function to achieve accurate user identification for telecom operators. The principle and implementation of PPPoE +-based broadband user identification technology were introduced. Implementation status of broadband access network equipments' PPPoE+function was investigated. Application strategy of PPPoE+ in the broadband access network was discussed.关键词：PPPoE+;user identification;subscriber access loop identification;broadband access network931|1354|0更新时间：2024-06-05
- 摘要：An innovative analysis of abnormal cell system was presented, abandoned the method of traditional macroscopic to microcosmic, directly facing the micro mobile network minimum unit “Sector Carrier”by“double cohort, the three threshold”analysis method. Performance anomaly area monitoring based on customer experience was closely related to the realization of customer experience problems, timely discovery and active optimization. Abnormal cell breaks the network quality evaluation system based on the traditional macro indicators, accounted for the abnormal cell micro level, the network quality was evaluated.关键词：mobile network;performance analysis;abnormal cell;customer perception;active optimization865|925|0更新时间：2024-06-05
- 摘要：VDSL2 vectoring and G.inp technologies and their progress were investigated. Based on the results of laboratory and field testing, VDSL2 vectoring and G.inp's functionalities, performance and interoperability were evaluated in detail. Combined with the status of telecom operators' networks construction and maintenance, VDSL2 vectoring and G.inp's deployment mode and equipment requirements in FTTx+VDSL2 scenario were proposed. Finally, development trend of VDSL2 vectoring and G.inp technologies and their application were given.关键词：VDSL2;crosstalk;vectoring;impulse noise protection;retransmission674|1214|0更新时间：2024-06-05
- 摘要：The establishment of an evaluation model of quantitatively assessing IMS network security was discussed, and an example about the evaluation process was given. The proposed network security assessment system could also be used to assess soft switch, mobile core network, and so on.关键词：IP multimedia subsystem;network security;quantitative assessment640|889|0更新时间：2024-06-05
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