最新刊期
卷 34 ， 期 11 ， 2018
- 摘要：In order to solve the problem of synchronization addressing and the inadequacy of power interaction among nodes in the current mobile wireless sensor network,a new data transmission algorithm for mobile wireless sensor network was proposed.Firstly,the broadcast mechanism was adopted to realize synchronous control packet transmission and reduce the pressure caused by the synchronization flow to the addressing process.Then regional node flow valve control mechanism was used,and data traffic between sink nodes and regional node links were recorded and got by interception,flow link equalization was further adopted to promote traffic equalization.in the further step.Finally,the limited bandwidth based on wheel number-sink link jitter screening mode could be identified,and the transmission failure due to limited bandwidth was reduced.Simulation results show that compared with the bandwidth of the root zone node and widely used in limiting transmission algorithm,node link stability encoding algorithm and hierarchical encoding algorithm,the data transmission bandwidth can be improved,the packet loss rate can be reduced,and the practical needs can be better met.关键词：mobile wireless sensor network;data transmission jitter;power loss equalization;broadcasting mechanism,frequency drift;flow control;data balance702|982|0更新时间：2024-06-05
- 摘要：P2P systems have been widely used in the field of file sharing,etc.However,DHT (distributed hash table) networks have no center,no authentication,and lack of node authentication mechanism,making existing DHT-based P2P systems vulnerable to external attacks such as Sybil attacks.A DHT security enhancement mechanism based on social network was proposed,which introduced the trust relationship of nodes in the social network into the DHT network to improve the recognition ability of Sybil nodes.The KAD (Kademlia) algorithm was used as an example to verify the experiment.Experimental results based on Facebook and Twitter datasets show that the proposed security mechanism is suitable for large-scale dynamic networks and can effectively defend against Sybil attacks.关键词：P2P;distributed hash table;social network;Sybil attack850|1331|0更新时间：2024-06-05
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Design and construction of hierarchical and cross-regional SDN verification and demonstration system
摘要：SDN architecture could bring excellent flexibility and manageability to the network.In order to provide a large-scale verification testbed and a pilot deployment environment for SDN-based new technologies and applications,a hierarchical and cross-regional SDN verification and demonstration system over CERNET was proposed,and a SDN verification and demonstration core network consisted of nine cities and thirteen nodes and an access network containing three data centers was built.Based on this system,several SDN-based technologies and applications such as CPE virtualization line service,IPv4/IPv6 transition technology,traffic monitoring and scheduling application and data center applications were deployed,verified and demonstrated.关键词：software defined networking;OpenFlow;verification and demonstration system;testbed777|1304|0更新时间：2024-06-05 - 摘要：For a MIMO downlink system with finite-bit feedback,combined with the Golden code and the precoding technology,a new precoding design criterion and its related codeword selection method,transmissionschemes and corresponding low complexity decoding methods were proposed.In fact,based on fully utilizing the characteristics that the Golden code could overcome the channel depth fading,a double precoding matrix was constructed as transmission signals by using the selected precoding codeword,so that the decoding complexity could be reduced to linear.In the meantime,a joint ML and MMSE decoding method was proposed for the traditional transmission scheme,which could dynamically adjust the decoding complexity based on a threshold.The numerical simulation results confirm the superiority of the proposed schemes and methods.关键词：MIMO system;precoding;Golden code;finite-bit feedback581|923|0更新时间：2024-06-05
- 摘要：On the basis of analyzing the equivalent function of the objective function of classical spectral clustering algorithm and the weighted kernel k-means objective function,an improved large-scale data spectrum clustring algorithm based on sampling subspace constraint was designed,the weighted kernel k-means iterative optimization was used to avoid the large resource consumption of Laplacian matrix feature decomposition,and by using data sampling and constraining the cluster center to the subspace generated by the sampling points,the use of all kernel matrices was avoided,thereby reducing the time-space complexity of classical algorithms.Theoretical analysis and experimental results show that the improved algorithm can greatly improve the clustering efficiency on the basis of maintaining similar clustering accuracy with the classic algorithm and verify the effectiveness of the proposed algorithm.关键词：large scale data spectral clustering;weighted kernel k-means algorithm;data sampling;matrix feature decomposition;kernel matrix265|734|0更新时间：2024-06-05
- 摘要：To optimal the node deployment of underwater wireless sensor network,a node deployment strategy with multi-metrics based on the grids was proposed.Firstly,the underwater environment was divided into some certain size grids.Then,based on number of nodes,coverage quality of nodes,lifetime of network,network redundancy,a multi-objectives model was proposed.In order to solve the model,cost function with constraint conditions was given.Based on the genetic algorithm,the cost and the energy consumption of the deployment method were computed.The simulation result shows that the energy consumption and the number of deployment nodes are reduced.关键词：underwater wireless sensor network;network redundancy;coverage fraction of the network;lifetime of network;genetic algorithm613|1201|0更新时间：2024-06-05
- 摘要：The cache replacement mechanism is one of the important research issues of the content center network.Considering the limited cache space,the reasonable replacement of the cache content becomes a key factor affecting the overall performance of the network.Therefore,a cache replacement scheme based on content value was designed.Considering the dynamic popularity of content,the cost of caching,and the time of the most recently requested,a more realistic content value function was built,and an effective content storage and replacement scheme was designed based on the content value function.Specifically,when the cache space was insufficient,the existing cache contents were replaced according to the value from small to large.Simulation results show that compared with the traditional replacement algorithms LRU,LFU and FIFO,the proposed scheme effectively improves the content cache hit rate of network nodes and reduces the average hops of users’ content acquisition.关键词：content-centric networking;content value;content replacement;caching438|1134|0更新时间：2024-06-05
- 摘要：Malware propagation is an important security problem faced by wireless sensor network (WSN).From the perspective of game theory,the microscopic mechanism of malware propagationin WSN was analyzed.The attack-defense game model of WSN was built,and the mixed Nash equilibrium solution of the model was obtained.With the solution,the infection probability of malware was determined and the theoretical model for the malware propagation in WSN was established.Meanwhile,a cellular automata model was proposed to simulate malware propagation process in WSN.Simulation experiments reveal the relationship between the propagation speed and the game parameters.The results of this study are of significance for people to formulate measures to reduce the propagation speed of malware.关键词：wireless sensor network;malware propagation;attack-defense game;cellular automation447|818|0更新时间：2024-06-05
- 摘要：Aiming at the problem of high delay of successive cancellation lists (SCL) decoding algorithm for polar codes,a multi-bit SCL (MSCL) decoding algorithm based on log-likelihood ratio was proposed.The multiple codeword bits could be decoded simultaneously at a single decision time.Without loss of SCL decoding performance,the decoding delay was reduced from 3N-2 clocks to 4N/M-2 clocks.Compared with the existing multi-bit SCL decoding algorithm,the MSCL decoding algorithm had a lower complexity of the path metric calculation.In order to reduce the decoding delay and memory space of the cyclical redundancy check (CRC) assisted SCL (CA-SCL) decoding algorithm,a segmented CRC assisted MSCL (SCA-MSCL) decoding algorithm was proposed,and a segmentation information codeword length correction algorithm was proposed.By adjusting the length of the relevant segment,the information bit index set A was guaranteed.Under the same premise,the corresponding information bit index at the end of each segment could be divisible by M.The SCA-MSCL algorithm could output decoded code words as early as possible by using multiple CRC decisions,thereby reducing the decoder’s storage space and decoding delay.关键词：polar code;multi bit decoding;MSCL;segmented cyclical redundancy check;decoding delay;storage space498|748|0更新时间：2024-06-05
- 摘要：Optimal relay selection can effectively improve the system performance in the communication network with cooperative relays from the view of physical layer security.The optimal relay selection schemes for relay transmission system with multiple single-antenna eavesdroppers were investigated,and the differences between the amplify-and-forward (AF) protocol and the decode-and-forward (DF) protocol were we discussed and compared separately.For comparison,the direct transmission without relay was also discussed.The theoretical analysis and simulation results show that the optimal relay selection scheme can effectively guarantee the security of the system.关键词：physical layer security;relay selection;amplify-and-forward;decode-and-forward;outage probability561|706|0更新时间：2024-06-05
- 摘要：According to the characteristics of Alpha image and the statistical characteristics of coding parameters of string matching algorithm,an Alpha image coding algorithm based on byte-size multi-variable long-length string matching was proposed.The algorithm firstly used a byte-type multi-variable long-code scheme for joint optimization coding of multiple string matching coding parameters,the offset parameter was then encoded using a segmentation mapping scheme with proximity offset prioritization.Finally,the matching string length parameter was matched with a segmentation coding scheme.The experimental results show that compared with LZ4HC,zlib,PNG and HEVC (x265),the proposed algorithm has the advantages of ultra-low complexity and high coding efficiency.关键词：image coding;Alpha image;variable-length-code;fixed-length-code;string matching323|1042|0更新时间：2024-06-05
research and development
- 摘要：In recent years,telecom operators have begun to make strategic transformation and layout to the smart home ecosystem.Telecom operators hope to build a smart home open platform to realize business ecology and intelligent operation,provide users with innovative business models and consumption experience.How to build an open platform for smart home based on the characteristics of operators has become a hot topic in the industry.The architecture mode and the existing problems of the mainstream open platform for smart home were firstly analyzed,then the key elements of open platform of telecom operators were studied.Finally,the key technical direction and application practice was proposed to build the open platform for the operators.关键词：smart home;open platform;micro services architecture647|625|0更新时间：2024-06-05
- 摘要：With the full popularity of internet technology and the rapid development of video services,video content has become the current home entertainment protagonist.With the diversity of terminals and the improvement of display technology,the carrier of video services is no longer a single television.Based on the operator’s IPTV service,combined with the development trend of smart home business,the core elements of the multi-screen interactive technology architecture of the next-generation video service were described in detail,the next-generation multi-screen interactive service with the core of TV screen was introduced,and the combination of future video multi-screen business and other emerging technologies was look forward.关键词：smart home;multi-screen interactive technology;TV screen365|1370|0更新时间：2024-06-05
- 摘要：As a new technology,virtual reality technology’s innovation on video brings users a completely new interactive experience.The developments in VR/AR industry at home and abroad were introduced.The IPTV-based demand of the VR was analyzed.Furthermore,the key technologies including video codec,projections,integrated service platform techniques,set top box,network transmission were also researched.At last,a solution and a process were presented from two different scenes.It’s also a solution for reference to the development of IPTV VR.关键词：IPTV;VR;solution917|1687|0更新时间：2024-06-05
- 摘要：Wi-Fi mesh is a kind of suitable for large or complex home wireless self-organizing network solution.It can provide users with full coverage,self-handoff and easy installation of high-quality wireless network.Wi-Fi mesh has many advantages,such as self-organizing,self-management,self-repair and self-balance.But the existing Wi-Fi mesh product implementation scheme is not uniform,complex,high terminal capability requirement and unable to interoperate.The realization of multi AP collaborative work in home network was firstly discussed,then the main current technology development of Wi-Fi mesh was analyzed,and the technical scheme and comparative analysis of home Wi-Fi mesh was focused on.Then,aiming at home application scenario,a Wi-Fi mesh technology implementation scheme for operators was presented,which was modularized,easy to realize,with low terminal capability requirement and good interoperability.关键词：Wi-Fi;mesh;self-organizing network;home network1065|2804|0更新时间：2024-06-05
- 摘要：The characteristics and differences of different DRM standards such as OMA,Microsoft,Intertrust,and ChinaDRM were compared.The requirements of DRM applications were presented.The key technologies of DRM were analyzed.Based on the high-tech set-top box commonly used in the industry,the architecture of DRM protection in IPTV high-definition video was designed.The hardware trust root of high security set-top box,remote download terminal key,double-encrypted content key and other mechanisms was put forward innovatively.Finally,the business process of decrypting DRM content was formulated and an implementation case was given.关键词：DRM;IPTV;UHD494|1314|0更新时间：2024-06-05
Smart home column
- 摘要：The requirements of interoperability,unified management and orchestration for heterogeneous SDN data center solutions have been identified.Based on the study of heterogeneous SDN interoperability,northbound interface and orchestration technology,SDN Hub was proposed as the orchestrator to satisfy the requirements.The architecture and system design of SDN Hub was also presented.Experiment result proves SDN Hub achieves the design goal of multi-controller access and heterogeneous resource pool scheduling.关键词：cloud computing;heterogeneous;orchestrator;SDN572|1007|0更新时间：2024-06-05
- 摘要：The preliminary construction of the NB-IoT network has been completed at this stage.The overall coverage is good,but there are more partial coverage holes,insufficient coverage of indoor difficult scenes,prominent interference problems and overlapping coverage.At present,the industry application of NB-IoT is low in maturity,and the application of the industry is in its infancy.Different terminal manufacturers have different specifications,which leads to major problems in the deployment process of network deployment.The NB-IoT network related indicators according to different business characteristics were analyzed,according to the main types of business of the internet of things.The coverage performance of such services was researched according to test data and statistical data.In-depth coverage analysis on the covers of manholes and poles was conducted.Overlapping coverage analysis gives an optimized solution to the business model with relatively concentrated service access.关键词：deep coverage;independent antenna feeder;access capability523|1308|0更新时间：2024-06-05
- 摘要：In the mobile network environment,the mobile honeypot resources are limited and the attack injection means are flexible,so it is necessary to dynamically deploy the honeynet to collaboratively detect the attack behavior characteristics.However,existing honey nets are susceptible to feature recognition attacks,malicious traffic within the network,and can’t be migrated across honeypots.Based on software defined networking (SDN) technology,an intelligent collaborative honeynet system (ic-Honeynet) was designed.It consisted of a reverse connection proxy module and a honeynet controller.Finally,an ic-Honeynet experimental environment was built and the effectiveness of the system was verified.The experimental results show that the throughput of the system is nearly linear,up to 8.23 Gbit/s; the additional increase in response delay is small,only in the range of 0.5 to 1.2 ms; the connection processing capability is also very strong,up to 1 473 connections/s.关键词：Honeypot;Honeynet;mobile network;software defined networking;reverse connection proxy505|1035|0更新时间：2024-06-05
- 摘要：The high concurrency and uninterrupted nature of internet applications requires high performance and scalability.Micro-service have become the preferred architecture for internet applications.Under the background of business-driven and “internet +” transformation,it is imperative for operators to implement micro-service transformation of traditional business platforms.The status and requirements of the operator's business platform were analyzed.The micro-service design scheme of the business platform was explained from several dimensions of micro-service splitting,micro-service architecture,interface design and DevOps,combining the key technologies of micro-service and benchmarks multiple technologies.关键词：business platform;micro-service;container466|1645|0更新时间：2024-06-05
- 摘要：In WDM-PON,the OAM data path and user data path were independent in the TC layer.The OAM data could be transmitted either transparently or by codec.Specifically,the transparent mode was preferred by the industry network due to the free of codec and low latency.Different from the existing transparent modes,such as base-band re-modulation and RF band,a novel method for the realization of auxiliary management and control channel was proposed,which was based on the DBPSK re-modulation and delay interferometer detection.Since the OAM data was re-modulated on the phase of user data,which was modulated intensively,it would not take any impact on the quality of user data.But,in both base-band re-modulation and RF band methods,the re-modulation of OAM data would introduce interference to the user data,which was not allowed in the demanding industry network.The proposed method is thought promising as one of the solutions for auxiliary management and control channel in WDM-PON.关键词：WDM-PON;OAM;AMCC429|897|0更新时间：2024-06-05
Wide angle of operation technology
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