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1.
潘洁  薛曌 《电信科学》2019,35(12):131-136
DPI 是运营商网络中用于流量识别和处理的专用设备,目前被大量部署于现网中。但传统的 DPI 部署方式带来了多个DPI系统并存、功能重复、维护管理复杂等问题,不利于DPI应用的大量标准化快速部署。随着NFV技术的发展,对DPI进行虚拟化部署成为解决此问题的一种趋势。Docker是一种容器级的虚拟化技术,可在其基础上进行DPI部署。阐述了Docker与DPI部署有关的底层报文处理技术DPDK,并给出了基于Docker的DPI虚拟化部署方案建议。  相似文献   

2.
DPI技术在移动数据网络分析的应用   总被引:2,自引:0,他引:2  
介绍了DPI技术,并在WLAN上进行了部署和数据分析,数据分析结果表明DPI技术能够较好地识别网络上的流量类别、应用层上的应用种类.  相似文献   

3.
目前DPI设备已在运营商现网中广泛部署,DPI测试成为DPI设备现网建设的重要环节,通过阐述DPI设备解析识别能力在DPI测试中的重要性,分析解析识别能力测试的需求以及难点,从流量构建以及业务模型等方面提出一种有效可行的DPI解析识别能力测试方法。  相似文献   

4.
由于运营商企业内部深度包检测技术(Deep Packet Inspection,DPI)系统为烟囱式部署,存在重复采、存、开发和数据格式不一致等现象,无法形成全量数据的全视景,没有充分体现数据价值,导致在其网络安全、运行维护、建设投资和数据有效复用等方面存在一些问题。随着宽带用户和手机用户的急剧增长,为提高网络资源利用率,发现和识别种类繁多的网络业务,并有效地控制和管理网络业务,急需对全网DPI设备部署位置进行整合,减少DPI采集点和设备数量,实现多个应用系统使用同一采集点的DPI设备复用机制,通过最少的采集点获取最全的数据。文中对运营商互联网DPI系统部署场景、链路接入方式、部署方案、未来发展趋势等进行了研究,力求为互联网DPI系统部署提供借鉴。  相似文献   

5.
DPI技术助力运营商精细化运营   总被引:3,自引:0,他引:3  
精细化运营是运营商发展的必然趋势,而DPI技术是实现精细化运营的基础之一。新型的DPI设备在功能、性能、实现和部署方面都有别于传统设备,这样的DPI设备才真正能够帮助运营商实现精细化运营。本文分析了DPI对运营商的现实意义,介绍了传统DPI设备及部署方式并分析了其缺点,提出了一种新型DPI设备及部署方式。  相似文献   

6.
移动数据流量业务逐渐增大,运营商的经营模式正在从“话务量经营”向“流量经营”转变,“大数据经营”将成为运营商的主要发展方向.运营商积极探索DPI技术对于大数据运营的价值和应用方向,制定标准的统一DPI系统规范,为大数据运营提供全面、标准的流量数据.系统分析了传统DPI部署方式存在的弊端,提出建设统一DPI系统对推动运营商大数据发展提供的重要基础数据保障作用.  相似文献   

7.
DPI技术力助运营商精细化运营   总被引:1,自引:0,他引:1  
通过2个实例介绍了深度包检测(DPI)技术在运营商精细化运营中的重要作用,分析了传统DPI设备在功能和部署方面的缺陷,在此基础上阐述了新型DPI的部署方式。  相似文献   

8.
DPI测试方案     
1 需求分析 DPI(深度报文检测)技术是业务检测、识别和控制的技术.基于应用层协议分析的DPI,已被各大运营商和主流产品供应商采纳,且已在广泛的测试和在线应用或者试应用.对现网应用进行业务识别、流量和客户行为分析,进而根据要求进行业务控制是运营商必然的选择.通过DPI技术可以给用户提供差异化服务,即通过DPI技术区...  相似文献   

9.
对等网络流量检测技术研究   总被引:1,自引:0,他引:1  
P2P流量检测技术可分为基于流量特征的识别方法(TLI)和基于深层数据包识别方法(DPI)。TLI通过对传输层数据包进行分析并结合P2P系统所表现出来的流量特征,来识别某个网络流是否属于P2P。DPI采用协议分析与还原技术,提取P2P应用层数据,通过分析其载荷所包含的协议特征值,来判断网络流量是否属于P2P应用。DPI由于具有准确性高、健壮性好、具有分类功能,是P2P流量识别的主要方法。如果能够结合TLI和DPI的优点,就有可能设计出一个准确、高效的P2P流量实时识别算法。  相似文献   

10.
随着我国3G网络的大规模部署,越来越多的增值业务开始被用户使用。运营商需引入DPI技术对不同业务进行检测和区分,为用户提供不同业务的差异化服务,从而提高网络资源利用效率和运营收益。介绍了DPI技术引入背景和基本原理,详细分析了DPI技术在WCDMA网络中的各种应用场景,重点研究了这些应用场景的DPI部署策略;通过分析比较DPI技术在不同应用场景下的不同部署策略,给出了DPI技术在WCDMA网络中的引入策略建议,为运营商在WCDMA网络中部署建设DPI提供技术参考。  相似文献   

11.
DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.  相似文献   

12.
This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel's.  相似文献   

13.
The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.  相似文献   

14.
Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.  相似文献   

15.
The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.  相似文献   

16.
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.  相似文献   

17.
Waveguide multilayer optical card (WMOC) is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling & processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic (VB) language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.  相似文献   

18.
It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.  相似文献   

19.
Due to variable symbol length of digital pulse interval modulation(DPIM), it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation(FDPIM) method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.  相似文献   

20.
The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.  相似文献   

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