最新刊期
卷 32 ， 期 8 ， 2016
- 摘要：With the increasing of traffic problems，such as traffic congestion，intelligent transportation system（ITS）becomes an effective way to solve the increasing transportation issues of the current traffic.Vehicular Ad Hoc networks（VANET）and vehicles as important parts of ITS have become focus of current research.Firstly，the development history and current situation of VANET both at home and abroad were introduced，and then VANET from the terminal system，management system，cloud system were analyzed respectively.Then，the V2V and V2R communication technologies of terminal system were introduced emphatically.In addition，VANET oriented traffic cloud and big data technology were outlined.Finally，application scenarios and the future development of communication technologies in VANET were discussed.关键词：vehicular Ad Hoc network;communication technology;terminal-management-cloud model843|2364|0更新时间：2024-06-05
- 摘要：Currently，the demand of emergency medical grows rapidly，informationization level of rescue system is low，and standards of information technology need to be improved.Based on the analysis of the current situation of the information service for ambulance，it was proposed that telematics of ambulance with the core of intelligent vehicle and remote diagnosis and treatment was an important development direction.Connotation，architecture，key technologies and service mode for telematics of ambulance were discussed.关键词：emergency medical service;ambulance;telematics719|2059|0更新时间：2024-06-05
- 摘要：The concept of artificial intelligence has been proposed for more than 60 years，with the development of internet of things and big data technology，more and more AI technology applications have been achieved.One of the most remarkable AI technology integration application is automatic driving technology.Firstly，the progress of automatic driving technology was studied.Secondly，key technologies of automatic driving were analyzed.Thirdly， the relationship between the telecom operator information service architecture and the requirements of automatic driving was analyzed.In the end，the technology breakthrough point of information service architecture with the core of application of artificial intelligence technology in the future were given.关键词：artificial intelligence;automatic driving;information service architecture;telecom operator1168|2240|0更新时间：2024-06-05
- 摘要：With the tremendous advantages of wireless technologies，it has been put forward higher requirements for intelligent transportation systems（ITS）.Pure Ad Hoc network or V2V communication is not reliable and sufficient for many applications.V2R communication is reliable，safe and comfortable.It can easily and quickly obtain real-time traffic information，because of the cooperation between V2V communication and V2R communication which can achieve the exchange of information between vehicles，drivers，and roads，and improve the convenience and comfort of the trip.Firstly，the characteristics of V2R communication were studied，then the network architecture was introduced.In addition，the connection for V2R communication was analyzed.Finally，the challenges of V2R communication were explored.关键词：V2R communication;network architecture;connectivity997|1949|0更新时间：2024-06-05
- 摘要：Two kinds of V2X technology were introduced briefly and several typical V2X use cases were listed.It was suggested that V2X applications should be deployed with vehicular active safety function firstly.Based on V2X communication of PLMN，operation requirements were provided，including identity authentication，communication function，interoperation of communication，interface with road transport system，operation and maintenance， especially including ideas of delivering identity certifications and measurement messages.关键词：vehicle to X;vehicle to vehicle;vehicle to infrastructure;vehicle to pedestrian;intelligent transport system822|2135|0更新时间：2024-06-05
- 摘要：The definition and difference between internet of vehicle and smart car were described.And the development situation of internet of vehicle all over the world was described.The problems and critical technology in the development of internet of vehicle were analyzed.At last，the prospects of internet of vehicle was given under nowadays situation in China.关键词：internet of vehicle;smart car;autonomous vehicle;information security;vehicle to vehicle;advanced driving assistant system1068|1910|0更新时间：2024-06-05
Car networking technology and application
- 摘要：Currently，MTC has two main characteristics：massive connectivity and sporadic transmission.Massive connectivity makes the access behavior non-orthogonal and the sporadic characteristic makes the user activity sparsity.Based on those characteristics，some literatures introduce a corresponding detection technique called compressive sensing based multi-user detection.Performance of multi-user detection technique was analyzed by evaluating the user activity detection performance and the user data detection performance.The simulation results conclude that the detection performance will be influenced by the cross correlation between the non-orthogonal spreading sequences，but CS-MUD can still support the massive connection scenario in which the user activity is sparse.关键词：machine type communication;non-orthogonal spreading;compressive sensing694|1463|0更新时间：2024-06-05
- 摘要：A user centric networking（UCN）structure based on SDN framework was proposed，which established an OpenFlow stream scheduling model named user group gaming policy.Non-cooperative and cooperative cross-layer scheduling were compared from UCN to control plane by extracting parameters of user gaming index and user expected bandwidth.Simulation results show that the user group satisfaction degree of cooperative gaming scheduling is the best and will help the communication operators to realize the concept of customer being king.关键词：user centric networking;software defined networking;user group gaming;cooperative gaming;satisfaction degree683|1168|0更新时间：2024-06-05
- 摘要：The existing MIMO channel simulation models are based on two-dimensional（2D）plane and can’t match with a three-dimensional（3D）radio propagation environment.A 3D MIMO channel simulation platform based on WINNER channel model was set up.After adding the vertical dimension in the model，the array patterns should be extended from 2D to 3D and 3D MIMO channel simulations were implemented.The simulation results of 3D MIMO channel parameters were validated by comparisons with the 3D measurements for an urban micro cell，good agreements could be observed.Simulation results show that the 3D channel correlation is bigger than 2D，however， its capacity has bigger improvement compared with 2D.关键词：3D MIMO;channel simulation;channel parameter;spatial correlation;channel capacity607|1450|0更新时间：2024-06-05
- 摘要：In massive MIMO systems，when the number of users is larger as that of antennas at base station（BS），the various channels may be significantly different.A new zero-forcing beamformer design algorithm was proposed based on joint user grouping and antenna selection for massive MIMO dowlink systems.All users were divided into two groups and then the group of users with a better channel condition was selected to receive signal with selecting an optimal antenna combination for each transmit data stream，in order that RF circuit cost and power consumption could be reduced substantially with a little loss of performance in massive MIMO systems.The simulation results show that the proposed algorithm provides a better trade-off between rate performance and hardware complexity in massive MIMO system.关键词：massive MIMO;user grouping;antenna selection;zero-forcing beamforming;hardware complexity585|1433|0更新时间：2024-06-05
- 摘要：In AODV protocol with the dynamic topology networks，the source node S requests a route to an arbitrary destination node D with flooding broadcast the RREQ message，but there is only one destination node sink in a WBAN，other nodes involved in receiving and forwarding RREQ have wasted energy except the nodes on minimum hop count routing.An energy balance AODV protocol with multicast route discovery for wireless body area networks was proposed，it increased the minimum hop count to sink hops，the next hop node to sink next and the node itself has the forwarding capability isforward three parameters in a hello message，and selects neighbors which could reach the sink only to participate in forwarding the RREQ message.This protocol effectively reduces the energy cost of the routing discovery through changing the broadcast to multicast，and prolongs the service life of WBAN with energy balance.The performance analysis and simulation experiment indicate that the proposed protocol is more advantaged than similar EAAODV in the number of RREQ，packet delivery ratio and energy consumption.关键词：wireless body area network;AODV protocol;route discovery;hello message351|1203|0更新时间：2024-06-05
- 关键词：RFID;ALOHAalgorithm;throughput;grouping，tagestimation147|352|0更新时间：2024-06-05
- 摘要：Multi-label classification methods have been applied in many real-world fields，in which the labels may have strong relevance and some of them even are incomplete or missing.However，existing multi-label classification algorithms are unable to handle both issues simultaneously.A new probabilistic model that can automatically learn and exploit multi-label relevance was proposed on label relevance and missing label classification simultaneously.By integrating out the missing information，it also provides a disciplined approach to handle missing labels.Experiments on a number of real world data sets with both complete and incomplete labels demonstrated that the proposed method can achieve higher classification and prediction evaluation scores than the existing multi-label classification algorithms.关键词：incomplete label;label relevance;multi-label classification;probabilistic model414|826|0更新时间：2024-06-05
- 摘要：Historical comments of requestors provide important references for Web service selections.However，the information is subjective.An approach to evaluate the confidence of the comments through differential induction based on data of objective QoS（quality of service）and subjective score of comments was proposed.Firstly，the similarity relation between requestors was judged，according to different values of QoS produced by the same service invoked by more than one requestor.Then，the evaluation algorithm of confidence was built based on previous similarity relation and the subjective score of the corresponding requestor.Finally，the balanced factor of confidence formed by the algorithm assessed whether the comments from requestors are reliable.Algorithm analysis and experimental results show that the method is feasible and effective.关键词：Web service;service requestor;service rating;credibility evaluation285|1068|0更新时间：2024-06-05
- 摘要：A cross-layer resource allocation model in multiuser OFDM system was proposed，which combined the channel state in physical layer and the user’s queue in MAC layer.The proposed hybrid optimization algorithm made use of the advantages of genetic algorithm and tabu search algorithm to improve the crossover of genetic algorithm.It would improve the global search ability，converge to the global optimal value faster，solve the cross-layer resource allocation problem more effectively and meet the user’s quality of service better.The simulation results show that the improved hybrid algorithm increases the throughput，reduces the average delay and improves the QoS of the system.关键词：OFDM;cross-layer;resource allocation;hybrid algorithm347|657|0更新时间：2024-06-05
- 摘要：To solve the problem of deterioration of system performance for the RF front-end distortion and IQ imbalance in orthogonal frequency division multiplexing（OFDM）system，a novel IQ imbalance frequency domain estimation and compensation algorithm was proposed.The effect of channel could be offset，the complexity of algorithm could be reduced and the implemention conld be achieved easily using two different pilot signals on one sub-carrier.The simulation results show that the algorithm not only greatly reduces the computational complexity，but also gets a better estimation and compensation performance，and the performance is better than traditional algorithms.关键词：OFDM;IQ imbalance;complexity753|1139|0更新时间：2024-06-05
- 摘要：Concerning the problem that wireless sensor network is vulnerable to many kinds of network attacks and compromise of nodes，a complete detecting system of sybil attack based on periodic ultra-bandwidth distance information was proposed.Firstly，the distance between the adjacent nodes was ranging and the hello data packet was exchanged.Then，the distance estimation form was constructed by local estimation，and the form was contained in each node.Meanwhile，multiple distance matching check was periodically executed for each node in the network.Finally，when there was the distance matching between the legitimate node at least two different nodes，it would give an alarm and discard the sybil nodes.If there was no distance matching，the node continued normal operations.IEEE 802.15.4 peer to peer sensor networks were adopted in the simulation experiments.Experimental results show that the proposed system not only can tolerate changes in the number of complicated sybil attacks，but also can successfully deal with the occurrence of complicated，malleable sybil attack.In addition，the probability of false alarm is very small，the entire network performance and its consistency are not affected.关键词：wireless sensor network;ultra wide band;sybil attack;distance estimation form;distance matching450|834|0更新时间：2024-06-05
- 摘要：In order to overcome the pilot contamination and reduction of decoding performance resulted by neighbouring cell pilot sequences reuse in multi-cell massive array MIMO system，a blind decoding method based on ICA was proposed.The proposed blind decoding method used ICA to separate the received signals of multi-cell users without using pilot sequences.Thus，pilot contamination was avoided and decoding performance would be optimized.Every user’s angle-of-arrival（AOA）was estimated for recognizing the desired user signals and overcoming the uncertainty of signals separated by ICA.The analytical performance and numerical results show that the proposed method has a better performance compared to MMSE decoding and blind decoding method based on singular value decomposition（SVD）.关键词：multi-cell;massive antenna array;blind decoding;independent component analysis273|726|0更新时间：2024-06-05
- 摘要：An improved algorithm called CLTree-R was proposed.It could compensate the shortcoming of CLTree algorithm such as low accurate and inefficiency.Then CLTree-R was applied in clustering analysis for UCI data sets.In order to improve the efficiency，data set was parallel processed on Spark platform.Experimental results show that this algorithm can get reasonable customer classification when making cluster analysis on official data set.关键词：clustering;Spark;data mining;parallelization477|926|0更新时间：2024-06-05
research and development
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Research and practice of centralized cloud-enabled service provisioning and activation system of PON
摘要：The business and technical challenges of provisioning and activation of optical network were elaborated.Design idea of centralized，cloud-enabled and extraction of IOE was proposed.The architecture of“platform+application”provisioning and activation of optical network was constructed.The key technical points like unified data model，distributed data storage，services，open architecture，interactive “message+data”interfaces，distributed process engine，explicited rules management，centralized configuration management under architecture of optical network were given.关键词：centralized;cloud-enabled;PON;provisioning;activation393|614|0更新时间：2024-06-05 - 摘要：Growing of Android malware，not only seriously endangered the security of the Android market，but also brings challenges for detection.A generation and extraction approach of automatic Android malware behavioral signatures was proposed based on HTTP traffic.Firstly，the behavioral signatures were extracted from the traffic traces generated by Android malware.Then，network behavioral characteristics were extracted from the generated network traffic.Finally，these behavioral signatures were used to detect Android malware.The experimental results show that the approach is able to extract Android malware network traffic behavioral signature with accuracy and efficiency.关键词：Androidmalware;HTTPtraffic;networkbehavioralcharacteristic;security459|2078|0更新时间：2024-06-05
- 摘要：In big data era，with business and management mode changing to “data driven”，the support model and support pattern of telecom operator analysis support system has changed.With the ASS planning，cloud ETL，MPP DB，ability service center and big data operation platform were constructed.Also，implementation thinking in aspects of IT，management and core competitiveness of ASS were proposed.关键词：analysis support system;big data;Hadoop;MPP380|1019|0更新时间：2024-06-05
- 摘要：Container is an operating environment which has relatively isolated resources running on top of the operating system kernel，and the development of container technology corresponds to the essential requirements of cloud computing.As a senior player in cloud computing field，the telecom operators must pay more attention to container technology.The technology background of container was briefly introduced，the potential application scenarios for telecom operators were analyzed，the preliminary exploratory cases for telecom operators were summarized，and the possible positive role of container technology in transformation and upgrade for telecom operators was discussed.关键词：container;cloud computing;virtual machine443|1851|0更新时间：2024-06-05
- 摘要：In recent years，machine learning has been widely used in network management.However，the complexity of the communication network is increasing，nonlinear and uncertain factors in the network make the machine learning more difficult.In order to improve the effect of machine learning，a scheme of artificial nervous network based on random projection was proposed.The characteristic of such scheme was the introduction of randomness in machine learning and network topology，which took the learning process more adaptability，and achieve faster and more accurate convergence.关键词：machine learning;random projection;neural network;network management280|1079|0更新时间：2024-06-05
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